universe & solar system section 8 Practice Questions Answers Test with Solutions & More Shortcuts
Universe, solar system and Astronomy PRACTICE TEST [13 - EXERCISES]
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universe & solar system section 13
Question : 11 [SSC LDEO & LCD 2011]
‘Super nova’ is
a) an exploding Star
b) a black hole
c) an asteroid
d) a comet
Answer »Answer: (a)
A supernova is a stellar explosion that is more energetic than a nova. During this short interval, a supernova can radiate as much energy as the Sun is expected to emit over its entire life span.
The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light).
Question : 13 [SSC CML (PRE) 2000]
The planet emitting green light is
a) Uranus
b) Neptune
c) Venus
d) Jupiter
Answer »Answer: (a)
The atmosphere of Uranus is composed of 83% hydrogen, 15% helium, 2% methane and small amounts of acetylene and other hydrocarbons. Methane in the upper atmosphere absorbs red light, giving Uranus its blue-green colour.
Question : 14
The inexhaustible source of energy of the stars is due to
a) decay of radioactive elements
b) excess of oxygen that helps burning and release of energy
c) conversion of helium to hydrogen
d) conversion of hydrogen to helium
Answer »Answer: (d)
A star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star’s interior and then radiates into outer space.
Question : 15
Study the following statements and select the correct answer from the codes given below:
- The average density of rocks in the lower crust of the earth is 3.
- There is a gradual decrease in the velocity of the seismic waves through the lower crust.
- The mantle-core boundary is marked by Moho-discontinuity.
- The outer core of the earth is in molten form.
a) 3 and 4 are correct
b) 1 and 4 are correct
c) 2 and 3 are correct
d) 1 and 2 are correct
Answer »Answer: (b)
The crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle.
The Earth’s crust is composed of distinctly different continental crust and oceanic crust, which have different chemical compositions and physical properties, and which were formed by different geological processes.
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Universe, solar system and Astronomy Shortcuts »
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indian geography mcq CATEGORIES
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» Nature & Scope of Geography
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» Universe, solar system and Astronomy
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» Geomorphology & Earth landforms
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» Atmosphere & Climatology
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» Hydrosphere & Oceanography
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» Pedology or Soil & Agriculture
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» Ecology & Bio geography
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» World Physical Geography
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» World Human Geography (Population)
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» World Economic Geography (Industry, Trade, Transportation & Agriculture)
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» World Country, Capital, Area, Currency, Parliament, Religion, New & old name of country
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» Physiography & Geomorphology of India
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» Indian Drainage, Irrigation and Rivers & River Projects
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» Indian Climate
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» Ecology, Environment, Forest, Naturals vegetations of India & National Park of India
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» Indian Agriculture & Animal Husbandry
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» Minerals & Energy Resources of India
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» Industries & Trade in India
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» Transportation & Ports System of India
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